From: Philipp Hagemeister <phihag@phihag.de>
Date: Thu, 24 Jul 2014 11:29:44 +0000 (+0200)
Subject: Replace failure handling with up-front check.
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Replace failure handling with up-front check.

The only time that write_string should fail is if the Python is completely braindead.
Check for that condition and output a more accurate warning.

See #3326 for details.
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